Add script to validate installed Android SDK packages

build/check_sdk_extras_version.py

Index: build/check_sdk_extras_version.py
diff --git a/build/check_sdk_extras_version.py b/build/check_sdk_extras_version.py
new file mode 100755
index 0000000000000000000000000000000000000000..f6d61f5549d45766f41373c983947c1a965e22b6
--- /dev/null
+++ b/build/check_sdk_extras_version.py
@@ -0,0 +1,120 @@
+#!/usr/bin/env python
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+'''Checks the status of an android SDK package.
+
+Verifies the given package has been installed from the Android SDK Manager and
+that it is at an appropriate version.

[cjhopman, 2015/06/17 21:18:45]

Clarify that we just check a minimum version.

[dgn, 2015/06/18 09:59:05]

Done.

+'''
+
+import argparse
+import json
+import os
+import re
+import sys
+
+
+COLORAMA_ROOT = os.path.join(os.path.dirname(__file__),
+                 os.pardir, 'third_party', 'colorama', 'src')
+
+sys.path.append(COLORAMA_ROOT)
+import colorama
+
+
+UDPATE_SCRIPT_PATH = 'build/install-android-sdks.sh'
+
+SDK_EXTRAS_JSON_FILE = os.path.join(os.path.dirname(__file__),
+                                    'android_sdk_extras.json')
+
+PACKAGE_VERSION_PATTERN = r'^Pkg\.Revision=(?P<version>\d+).*$'
+
+PKG_NOT_FOUND_MSG = ('Error while checking Android SDK extras versions. '
+                     'Could not find the "{package_id}" package in '
+                     '{checked_location}. Please run {script} to download it.')
+UPDATE_NEEDED_MSG = ('Error while checking Android SDK extras versions. '
+                     'Version {required_version} is required for the package '

[cjhopman, 2015/06/17 21:18:45]

Maybe clarify that this is just a minimum version.

[dgn, 2015/06/18 09:59:05]

Done.

+                     '"{package_id}". Version {actual_version} found. Please '
+                     'run {script} to update it.')
+REQUIRED_VERSION_ERROR_MSG = ('Error while checking Android SDK extras '
+                              'versions. '
+                              'Could not retrieve the required version for '
+                              'package "{package_id}".')
+
+
+def main():
+  parser = argparse.ArgumentParser(description=__doc__)
+  parser.add_argument('--package-id',
+                      help=('Id of the package to check for. The list of '
+                            'possible ids can be obtained by running '
+                            'third_party/android_tools/sdk/tools/android list '
+                            'sdk --extended'))
+  parser.add_argument('--package-location',
+                      help='Path to the package\'s expected install location.')
+  parser.add_argument('--stamp',
+                      help=('If specified, a stamp file will be created at the '
+                            'provided location.'))
+
+  args = parser.parse_args()
+
+  required_version = GetRequiredVersion(args.package_id)

[cjhopman, 2015/06/17 21:18:45]

I'd call this minimum_version to make it clear that it doesn't have to match
exactly.

[dgn, 2015/06/18 09:59:05]

Done.

+  CheckPackageVersion(args.package_id, args.package_location, required_version)
+
+  # Create the stamp file.
+  if args.stamp:
+    with open(args.stamp, 'a'):
+      os.utime(args.stamp, None)
+
+  sys.exit(0)
+
+def ExitError(msg):
+  sys.exit(colorama.Fore.MAGENTA + colorama.Style.BRIGHT + msg +
+           colorama.Fore.RESET)
+
+
+def GetRequiredVersion(package_id):
+  with open(SDK_EXTRAS_JSON_FILE, 'r') as json_file:
+    packages = json.load(json_file)
+
+  for package in packages:
+    if package['package_id'] == package_id:
+      return int(package['version'].split('.')[0])
+
+  ExitError(REQUIRED_VERSION_ERROR_MSG.format(package_id=package_id))
+
+
+def CheckPackageVersion(pkg_id, location, required_version):
+  version_file_path = os.path.join(location, 'source.properties')
+  # Extracts the version of the package described by the property file. We only
+  # care about the major version number here.
+  version_pattern = re.compile(PACKAGE_VERSION_PATTERN, re.MULTILINE)
+
+  if not os.path.isfile(version_file_path):
+    ExitError(PKG_NOT_FOUND_MSG.format(
+      package_id=pkg_id,
+      checked_location=location,
+      script=UDPATE_SCRIPT_PATH))
+
+  with open(version_file_path, 'r') as f:
+    match = version_pattern.search(f.read())
+
+    if not match:
+      ExitError(PKG_NOT_FOUND_MSG.format(
+        package_id=pkg_id,
+        checked_location=location,
+        script=UDPATE_SCRIPT_PATH))
+
+    pkg_version = int(match.group('version'))
+    if pkg_version < required_version:
+      ExitError(UPDATE_NEEDED_MSG.format(
+        package_id=pkg_id,
+        required_version=required_version,
+        actual_version=pkg_version,
+        script=UDPATE_SCRIPT_PATH))
+
+  # Everything looks ok, print nothing.
+
+
+if __name__ == '__main__':
+  main()